基于综合权重—模糊物元法的岩溶地区隧道围岩质量评价

doi:10.11872/j.issn.1005-2518.2023.03.153

Abstract

Abstract:

The distribution area of karst in China can reach about 33% of the country’s land area，therefore，in the process of tunnel excavation and construction in karst area，it is inevitable to cross the karst development location.At the same time，due to the hidden nature and irregularity of karst development，water and mud surges may occur locally in tunnel excavation，which greatly reduces the safety and stability of the tunnel and easily causes collapse accidents and threatens construction safety.To solve this problem，the geological situation of the surrounding rock needs to be fully grasped.Therefore，the evaluation of the quality of the surrounding rock is of great significance to the safety of tunnel rock design and construction.In order to scientifically and accurately evaluate the surrounding rock quality of karst tunnels，CRITIC method was used to determine the objective weight of the surrounding rock quality index affecting the tunnel in karst areas according to the measured data.The improved analytic hierarchy process was used to determine the subjective weight，and the combined weight was used to calculate the comprehensive weight of each index.Finally，the classification of surrounding rock was determined according to the fuzzy matter-element theory.Thus，the evaluation method of surrounding rock quality of tunnel in karst areas based on the comprehensive weight-fuzzy matter-element method was proposed，and this method was applied to the evaluation of surrounding rock quality of tunnel group in the seven-star data center of Tencent in karst areas.The research results show that the comprehensive fuzzy evaluation model established by introducing variance coefficients to the CRITIC method and introducing optimal transfer matrix optimization AHP method can avoid the influence of purely human subjective factors and evaluate and grade the rock quality more objectively and comprehensively.The evaluation results are in good agreement with the actual on-site grading，and the method can achieve a more scientific and accurate comprehensive determination of karst tunnel quality.The rock quality of the tunnel in this project example is mainly Ⅳ and Ⅴ surrounding rocks，which are poor and less stable，and the support of the surrounding rocks need to strengthen.

Key words: tunnel in karst area, quality evaluation of surrounding rock, comprehensive weight, fuzzy matter-element method

CLC Number:

TD853

Weizhong ZHANG,Wei YUAN,Qinrong KANG,Yuandi XIA,Mengling LI. Quality Evaluation of Tunnel Surrounding Rock in Karst Area Based on Comprehensive Weight-Fuzzy Matter-element Method[J].Gold Science and Technology, 2023, 31(3): 487-496.

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一级指标	二级指标	指标编号	稳定性等级
一级指标	二级指标	指标编号	Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅴ
围岩岩体结构特征	结构类型	X₁	整体结构（0.9~1.0）	整体块状（0.7~0.9）	层状（0.5~0.7）	破碎状（0.3~0.5）	散体状（~0.3）
	岩体RQD/%	X₂	90~100	75~90	50~75	25~50	<25
	岩体单轴抗压强度 /MPa	X₃	200~300	100~200	50~100	25~50	0~15
	岩体完整性系数	X₄	0.75~1.00	0.55~0.75	0.30~0.55	0.15~0.30	0.00~0.15
	节理间距/m	X₅	0.8~2.0	0.3~0.8	0.2~0.3	0.1~0.2	0.00~0.1
围岩地质特征	地下水/（L·min^-1）	X₆	<25	25~50	50~100	100~125	125~200
	软弱夹层性质	X₇	无夹层（0.9~1.0）	软岩、岩块（0.7~0.9）	岩屑（0.5~0.7）	岩屑夹泥（0.3~0.5）	泥夹岩屑、泥质（~0.3）
	岩层倾角/（°）	X₈	<10	10~15	25~45	45~60	60~90
	KBQ	X₉	>550	550~451	450~351	350~211	≤210

工程编号	断面位置	断面编号	指标平均取值
工程编号	断面位置	断面编号	X₁	X₂	X₃	X₄	X₅	X₆	X₇	X₈	X₉
A₁	进口	S1	0.2	52.3	14.0	0.42	0.35	102	0.2	6	232.7
B₁	进口	S2	0.4	42.4	18.4	0.36	0.22	100	0.2	15	229.6
B₁	出口	S3	0.2	52	42.6	0.41	0.18	100	0.3	15	312.6
B₂	进口	S4	0.2	45.7	19.9	0.38	0.02	105	0.4	10	156.8
B₂	出口	S5	0.2	55.6	22.4	0.43	0.05	108	0.2	8	173.5
B₃	进口	S6	0.4	65.5	42.9	0.49	0.26	98	0.4	12	336.1
B₃	出口	S7	0.5	68.8	47.4	0.51	0.30	95	0.2	14	348.9
B₄	进口	S8	0.2	52.3	34.2	0.42	0.10	101	0.2	12	209.4
B₄	出口	S9	0.4	49.0	30.6	0.39	0.14	106	0.4	15	198.3
B₅	进口	S10	0.2	42.4	14.5	0.36	0.08	96	0.2	11	166.3
B₅	出口	S11	0.4	42.4	18.2	0.35	0.04	94	0.3	15	167.1
B₆	起点	S12	0.4	49.0	20.4	0.39	0.34	99	0.4	14	245.0
B₆	终点	S13	0.4	52.0	25.6	0.41	0.30	102	0.1	12	265.3
油库	起点	S14	0.4	52.0	21.4	0.41	0.29	97	0.4	13	249.0
油库	终点	S15	0.2	65.5	14.5	0.48	0.24	100	0.3	10	248.9

指标编号	权重	指标编号	权重
X₁	0.141	X₆	0.025
X₂	0.055	X₇	0.175
X₃	0.148	X₈	0.105
X₄	0.040	X₉	0.079
X₅	0.232

指标编号	权重ω	指标编号	权重ω
X₁	0.230	X₆	0.076
X₂	0.049	X₇	0.148
X₃	0.061	X₈	0.095
X₄	0.185	X₉	0.118
X₅	0.039

指标编号	因素	主观权重	客观权重	α	β	综合权重
X₁	结构类型	0.230	0.141	0.594	0.406	0.194
X₂	岩体RQD	0.049	0.055			0.051
X₃	岩体单轴抗压强度	0.061	0.148			0.096
X₄	岩体完整性系数	0.185	0.040			0.126
X₅	节理间距	0.039	0.232			0.117
X₆	地下水	0.076	0.025			0.055
X₇	软弱夹层性质	0.148	0.175			0.159
X₈	岩层倾角	0.095	0.105			0.099
X方正汇总行₉	KBQ	0.118	0.079			0.102

Quality Evaluation of Tunnel Surrounding Rock in Karst Area Based on Comprehensive Weight-Fuzzy Matter-element Method

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